Rotary boring-drill.



H. R. HUGHES..

ROTARY BORING DRILLr APPLxcATloN FILED Dsc. 26; 191s.

Lfs@ 1 111111111 111.1111918.

@51j wb/ Strom/w13 www nutren sra'rns rfa HOWARD B. HUGHES, 0F HOUSTONI', TEXAS, ASSIGNOB TO vIEIUGAHIE'S TOOL COMPANY, OF HOUSTON, TEXAS, A CORPORATION OF TEXAS.

normen Bonmenmnr.. p.

s peclcation of ALetters Patent. Patented Feb. 19, 1918.

Application lediDece'mber 26, 1916. Serial No. 138,819.

To all lwhom z't may concern: l

Be it known that 1l-IOWARD R. HUGHES, a citizen of the United States, residing at Houston, Texas, have invented a ce1-tain `new and useful Improvement in` Rotary strong and composed of a few large parts.

Another object is to provide a roller drill in which the roller cutters are mounted in a pocket, the side walls of which extend over a' substantial-portion of the cutters, forming a shroud protecting them. Another object is to provide a roller drill in which the water holes for admitting Hushin water to the bottom of the hole being drilled, are so arranged that their outlets are ver; close tothe material upon which the drill is operating, and which are so ar-v ranged that the water issuing from these holes impinges directly upon the surface being drilled. Other objects and desirable featuresor the invention will be hereinafter pointed out, and will clearly appear in the description of my device.'

ln the drawings which illustrate the preferred form of my invention, and in which like characters of reference designate like parts,

Figure 1 is la side elevation of the assembled device, certain features being shown therein in dotted lines.

Fig. 2 is an end View of the assembled device illustrated in Fig. 1.

Fig. 3 is a sideelevation of one of the.

. members ofthe drill head.

Referring to the drawings, 1 designates two members that coperate with each other ate to form a threaded neck adapted to receive a drill collar, 12, which collar can be of any ordinary construction. This collar when screwed in place upon the neck 3,

Aholds the members of the drill head in assembled position. Upon each reduced portion 3, is a still further reduced portion 4, which is also threaded and adapted when the drill head is assembled to receive a lubricant container for furnishing lubricant to the various surfaces in the .drill requiring such. Formed in the end of each member 1, is a recess 5, one wall 13 of which, as shown in dotted lines in Fig. l, is inclined to the longitudinal axis of the drill head.

For convenience this wall 13 will be called roller 'l'. These rollers are mounted upon.

spindles 8, which are in turn rigidly attached to the members 1. rlhe precise form of these rollers and the method of mounting forms 'no part of this invention, these features having heretofore been fully covered in several of my earlier patents, and any form of roller and'mounting therefor, disclosed in my prior patents showing such features, may be used 1n the device forming the subject matter of this invention.

Such rollers,however, should be so proportioned and so arranged that the unhoused part of the rollers will extend beyond the outer surface of the drill head to thus' cut a hole of greater diameter than the drill head, so as to prevent any sticking or binding of the drill in the hole which it cuts. v

Extending through the drill head from the threaded extension 4, are lubricant ducts 15. leading to the bearings 8.

Formed in the meeting' faces of the members 1, arelongitudinal grooves 10. These grooves extend throughout-the length of the los drill head. and are so arranged that they will register when the drill head is, in assembled position to form continuous passages through the drill head. The upper.

fore in proximity to the bottom of the hole when the drill is in use. The water passages 10 are extended down through the walls 6, and are so arranged that any Water forced therethrough v will issue from the bottom ends of the vpassages at points substantially at the bottom ofthe walls 6 in drill structure, and which will impinge directly upon the surface being operated upon by the drill.

As shown at 11 the members of the drill are liattened or cut away upon each side so as to atl'ord a larger passage-way between lthe outer surfaces of the drill head and the Wall of the hole beingl bored, thus enabling the flushing water introduced to the bottom of the hole through the water passages to more readily carry of thecuttings and disilntiegrated material from the bottom of the In assembling the `device the cutting rollers 7 are placed in position and the two members. l placed'with their meeting surfaces in contact, so that the threads on the extensions 3 will register to form a continueus thread. A drill collar is then screwed upon this extension 3, thus holding the members of the drill head together, with the cutting rollers in operative position. Vhen so assembled, the grooves 10 register to form continuous water passages as set forth above, and the recesses 5 also register, forming a pocket having the side walls 6. These side walls because of their triangular shape, extend inwardly between the cutting rollers and form a shroud or housing for a substantial portion of both cutters. From this structure it is evident that the shrouds 6 extend to within a short distance of the bottom of the hole and that jets of water issuing from the water passages will be unobstructed and will strike directly against the bottom of the hole.

Having thus described my invention', what I claim as new and desire to secure by Letters Patent is:

1. A drill, provided with a head, a pocket in the end of the head having the end walls thereof inclined, cutting rollers mounted in the pocket on the inclined end walls thereof, the side walls of the pocket being so extended as to house the major portion of the rollers.

2. A drill provided with a head, a pocket in the end of the head having the end walls thereof inclined to the longitudinal axis of the head, approximately conical shaped cutting rollers mounted in the pocket on the inclined walls thereof, the side Walls of the pockets forming a housing for the cutting rollers, a substantialportion of the rollers being thus housed.

3. A drill comprisingl a head composed of a plurality of parts,a recess in the end of each part, the end wall of eachv recess being inclined to the longitudinal axis ofthe drill head, a cutting roller mounted on the in.

clined end wall of each recess, the recesses being adapted tov register when the drill head is assembled, so as to form a pocket in which the cutting rollers are partially housed, the side walls of such pocket forming a protecting shroud for the rollers.

4. A drill provided with a head, a pocket in the end of the head, cutting rollers mounted in the pocket, the side walls of the pocket forming a housing covering a substantial portion of the cutting rollers, Water passages extending through the drill head and through the side walls of the pocket, said passages being so arranged that jets of water issuing therefrom will strike upon the bottom of the hole being cut by the drill.

5. A drill provided with a head composed of a plurality of members, recesses in the ends of these members, cutting rollers mounted in the recesses, the side walls of the recesses forming a housing for a substantial portion of the cutting rollers.

6. A drill provided with ahead, a pocket in the end of the head, cutting rollers mounted in the pocket, the vside walls of the pocket forming a housing for a substantial portion of the cutting rollers, Water courses in the head, portions of the head being cut away to permit the ready passage of water therearound when the drill is in operation.

7. A- drill provided with a head, a pocket in the end of the head, cutting rollers mounted in the pocket, the side walls of the pocket forming'a housing for a substantial portion of the cutters, the side walls extending partly between the cutters, water courses in the drill head extending through the side Walls, so that the water passing therethrough will impinge directly upon the bottom of the hole being cut by the drill.

8. A drill comprising a head composed'of a plurality of parts, the meeting faces of which lie in a plane parallel to the longitudinal axes of the head, recesses in the ends 'of the parts, the end Walls of which are in- "tlined relative to the plane of meeting of the parts of the head, substantially cone shaped cutters mounted in the recesses, longitudinal grooves in the meeting faces of roo fmeseell 1 fill is in assembed position, the ower porston to form channels for the passage of ations of the grooves passing through the uid therethrough.,

side wals of the pocket and terminating l En testimony whereo hereunto aix my E@ near the bottom end thereof, the outer sursignature this the 221mg day of Decembre@s faces of the parts of the dril head being cui; 1916.,

` away, the cut-away portions being acszpee to register when the drl is in assembled pas HOWARD R HGS 

